Offgrid solar
To design an off-grid solar system for a 1.5-ton inverter AC, you will need to consider a few key factors. Here's a general step-by-step guide to help you design the system:
1. Determine the Power Requirement: First, find out the power consumption of your 1.5-ton inverter AC. It is typically around 1.7 kW to 2.2 kW. Let's assume it's 2 kW for this example.
2. Calculate Daily Energy Consumption: To determine the daily energy consumption of your AC, multiply its power consumption by the number of hours you intend to use it. For instance, if you plan to run the AC for 8 hours a day, the daily energy consumption would be 2 kW * 8 hours = 16 kWh (kilowatt-hours).
3. Consider System Efficiency and Losses: Solar systems have efficiency and losses associated with them. As a general rule, assume a system efficiency of around 75% to account for losses due to inverter efficiency, wiring, battery losses, and other factors. So, divide the daily energy consumption by the system efficiency: 16 kWh / 0.75 = 21.33 kWh.
4. Battery Sizing: Determine the battery capacity required to provide sufficient backup for your AC. Consider the autonomy you desire, which is the number of days you want the system to run without solar input. Let's assume you want two days of autonomy. Multiply the daily energy consumption by the number of autonomy days: 21.33 kWh * 2 = 42.66 kWh.
5. Account for Depth of Discharge (DoD): Batteries should not be discharged fully to maintain their lifespan. Assume a depth of discharge of 50% to ensure battery longevity. So, divide the required battery capacity by the DoD: 42.66 kWh / 0.5 = 85.32 kWh.
6. Solar Panel Sizing: Determine the solar panel capacity needed to charge the batteries and meet the energy demand. The size of the solar panels will depend on your location's solar irradiation. Let's assume an average solar irradiation of 5 peak sun hours per day. Divide the daily energy consumption by the number of peak sun hours: 21.33 kWh / 5 hours = 4.27 kW.
7. Inverter Sizing: Choose an inverter that can handle the power requirement of your AC. In this case, select an inverter that can handle at least a 2 kW load.
Remember that these calculations are approximate, and it's advisable to consult with a professional solar system installer who can provide a more accurate design based on your specific location, climate, and energy consumption patterns.
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